body {
    margin: 0;
    font-family: 'Arial', sans-serif;

    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center;
    color: #fff;
}

.el-card {
    background-color: rgba(30, 58, 86, 0.9); /* 半透明背景 */
    color: #fff;
}
